1128258809 has 2 divisors, whose sum is σ = 1128258810. Its totient is φ = 1128258808.

The previous prime is 1128258773. The next prime is 1128258821. The reversal of 1128258809 is 9088528211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 815959225 + 312299584 = 28565^2 + 17672^2 .

It is a cyclic number.

It is not a de Polignac number, because 1128258809 - 2²⁴ = 1111481593 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1128258809.

It is not a weakly prime, because it can be changed into another prime (1128258409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564129404 + 564129405.

It is an arithmetic number, because the mean of its divisors is an integer number (564129405).

Almost surely, 2^1128258809 is an apocalyptic number.

It is an amenable number.

1128258809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1128258809 is an equidigital number, since it uses as much as digits as its factorization.

1128258809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92160, while the sum is 44.

The square root of 1128258809 is about 33589.5639894298. The cubic root of 1128258809 is about 1041.0451798470.

The spelling of 1128258809 in words is "one billion, one hundred twenty-eight million, two hundred fifty-eight thousand, eight hundred nine".